Absolute Must have: Quicksilver exhaust on early Diablo.

That huge muffler was obviously designed by a committee. The Quicksilver pipes (no muffler at all) are a huge improvement in every way.

 

Dear Lamborghinisti,

Scale,

you only have the test pipes. You also need the other half....the resonators that replace the two rear cats. Your primary cats remain. As you probably know, I'm in the middle of installing a full quicksilver system...headers on back.


Shamile

Freeze..Miami Vice !

 

Scale,

Could you please elaborate?

When you say there was 1/2" missing....too short at the coupler?

What did George say?


Shamile

Freeze...Miami Vice !

 

The brackets on the pipes probably need a little modification to fit well but as aftermarket exhaust installation goes it is negligible.

It sounds like your mechanic isn't good at "outside the box" thinking.
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Sorry this a re-post in a similar thread, but it really belongs in this one.


Does anyone know what the inside of the stock Diablo muffler looks like? I bet its probably pretty free flowing in its own right.


I think if you de-cat it would be similar.

The weight savings might be an issue if you were racing. I have heard estimates of savings of 35 to 60 pounds. That much weight on the street is not an issue, the car is still a brick no matter even if you took the whole exhaust system out entirely.

I have gone the cheapo way and de-catted, stock muffler, reverse tailpipes. On my Ferrari you see the exhaust from the back, thats why I put the 4k into it, but the Diablo................. you don't even see the exhaust except the tailpipes. Seems a shame to cover it all up.

P.S.: just my 2 cents

 

There is absolutely no reason that a good fabricator couldn't make a set of pipes very easily Just look at the pictures and use the stock muffler for a pattern for flange placement. You wouldn't need to use stainless if you wanted to save money (they don't show).

I have no idea what is inside the big box but it quiets things down way too much, radiates a lot of heat and is just unnecessary in many ways. Considering the space that is reclaimed, the Diablo could almost have a trunk where the muffler had been.

 

Could the boxes be different or modified? You say that in your opinion the box is to quiet, but mine seems to be just right. Actually its louder than my Testarossa with an X-OST muff and Hyper flow cats, the sound is different but louder.

 

I will make some pipes in lieu of my muff soon, but for now the straight pipes I made for the cats are fine. I think thats were you loose your free flow, in the cats, especially old cats.

 

If you are pleased, far be it from me to criticize.

 

Yes, a good fabricator could make a system as quicksilver did. I would warn anybody not to use galvanized exhaust tubing as it will not last. We have had 2 Diablo’s come in with muffler shop systems made in steel, 1 car had a failed tube that cracked and eroded the metal at a bend, similar to the 355 manifold failures, (it almost caught on fire from the flames on deceleration). The other car came in running bad, it had a restriction in the pipe internally as the inner layer of the double wall pipe collapsed, you could not see it as the outer layer was ok.

There is a tremendous amount of heat going thru the pipes at speed; it even turns the stainless steel yellow/purple after some spirited runs.

The main idea behind removing the rear cats is to get the heat out of the engine compartment, especially during heat soak when the car is turned off, the other reason is to remove the exhaust flow restriction.

We have tried different combinations of bypass pipes, gutting damaged converters, and installing the resonators.
If you just want to make the car loud, yes you can install the cat bypass pipes and the quicksilver muffler but if you want a loud pleasant sounding tone without any resonance then the resonators are the best choice. This all varies as to weather or not you have a later car with precats also.

Bottom line is what 2NA said, “If you are pleased, far be it from me to criticize”

george

 

Dear Lamborghinisti,

+1

I really am in the middle of this problem.

The Diablo rep. for cracked headers is a Roadster specific issue. As gtf40 mentioned, too much heat is retained in the engine bay. Unlike the typical Diablo rear deck, the roadster only has one triangular vent to release heat....not enough.

In addition to the headers, I'm going with the whole system to eleviate some heat.

Kenco,

The weight savings from the OEM muffler is "nice" but it's really to get the heat out of the engine bay.

Scale,

I agree with 2NA and gtf40, there is enough play in the complete system to make up any minor shortfall in distance. Even in an early system, there really is quite a bit of adjustment from the collector pipe to the cats. You even have play in the mounting brackets and could even bend a bracket to fit.

I've heard of alot of people installing the quicksilver but no mention of ill fitting parts. Now, I've heard about Larinni being ill-fitting.

BTW,

I'm with Kenco, scale bring y'alls Diablos to my place and could have an exhaust party ! 2NA, you're invited as well

One thing I would like to mention...

If you do go the "cheap" route with midas muffler pipe, it will rust and scale. This is more of a problem for a diablo because to access the back of the engine for accessory belts, Alt, AC compressor, it is much easier to just pull the exhaust and have a nice space to work. With the stainless quicksilver, you won't have the corrosion problem.

When I bought my Roadster, it already had the secondary cats removed with an el-cheapo bypass. It looks ugly and was held together by rusty clamps....yuk !

Shamile

Freeze...Maimi Vice !

 

If you look carefully at the photos that I posted you will see how I modified the mounting brackets to get the pipes and resonators to bolt up. The slots needed to be extended quite a bit but it was not a big job. Once the pipes were in place the tips weren't a problem.

 

Shamile, I don't agree, The original cats appear to be made from steel, they are defiantly not stainless. What needs to be done to make a cat bypass is to remove the cats and cut off the ends and re-weld a suitable pipe in its place, at all the correct dimensions. Also you need to know how to weld to make it pretty. Then paint he whole pipe with some high temp paint 1200 degree, the color of your choice.

 

Typically catalytic converters are made from stainless steel. The extreme temperatures that they operate at will cause them to discolor and they may have a rusted appearance.

 

imo, the best thing to do is remove the headers, take all that silly aluminum insulation off (all it does is keep the heat in the headers) and have the headers jet hot (ceramic) coated inside and out. That will preserve the headers from future damage, and it actually keeps the steel of the headers from getting so hot. The heat passes through with the exhaust gasses since the ceramic on the inside insulates the steel. It is amazing how you can touch them with your hand not long after turning the engine off and they won't burn you! And they look a hell of a lot better, especially on the early Diablos and SE30s with the cool-looking header design. Then pick your exhaust of choice, and your headers will last and look better.

 

2NA,

I looked a little closer at your pix. I see what you mean. You bent up the tab and elongated the hole....good stuff !

See....you learn valuable information everyday !

BTW,

I have a full thread on my header removal and installation while the engine is IN the car. It's on LP. I would have posted it on this board but there's just not enough in-depth technical help here.

Now, if I need help with what wheels to buy or " look at my new wheels " this board is great. ....very good for polite conversation.


Shamile

Freeze....Miami Vice !

 

Yeah....take that Kenco !


Shamile

Freeze..Miami Vice !

 

Vaholtorf,

+1

Very good point !

This is exactly what I did with the quicksilver headers I bought from George @ Evans Automotive. He actually offers them in Jethot as an option. They have a beautiful chromed / polished appearance.

What you mention about the steel being damaged from the inside is exactly why it's not good to use typical header wrap. Again as you mention, the jet hot coats the inside so the metal is encapsulated....thus cooler temps and longer lasting.

This really matters on the roadster !


Shamile

Freeze...Miami Vice !

 

good post victor. coming from you, it's the gospel. now i have another project when i get your exhaust. See you in Montreal!